Depending what he was doing in call center and if he wants to keep his current job or is open to find a new job, he might be able to find a job for a company that hire people remotely. He can even look for this kind of job internationally. Some industries have been hit quite hard, but some others have seen increase of activity (i'm thinking in the saas world, mainly tools that are being use for remote working, but i'm sure there's other industries as well)